LTC1279 LINER [Linear Technology], LTC1279 Datasheet - Page 5

• Manufacturer Part Number: LTC1279
• Description: 12-Bit, 600ksps Sampling A/D Converter with Shutdown
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
TI I G CHARACTERISTICS
The
temperature range; all other limits and typicals T
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground with DGND and
AGND wired together (unless otherwise noted).
Note 3: When the analog input voltage is taken below V
unipolar mode) or above V
product can handle input currents greater than 80mA below V
for unipolar mode) or above V
Note 4: When these pin voltages are taken below V
mode), they will be clamped by internal diodes. This product can handle
input currents greater than 60mA below V
without latch-up. These pins are not clamped to V
Note 5: AV
600kHz, t
Note 6: Linearity, offset and full scale specifications apply for unipolar and
bipolar modes.
–0.5
–1.0
1.0
0.5
W U
0
0
indicates specifications which apply over the full operating
Integral Nonlinearity vs
Output Code
f
r
SAMPLE
512
DD
= t
f
= DV
1024
= 5ns unless otherwise specified.
= 600kHz
DD
1536
OUTPUT CODE
= V
2048
DD
DD
= 5V, (V
, it will be clamped by internal diodes. This
2560
DD
without latch-up.
3072
W
SS
3584
= – 5V for bipolar mode), f
1279 G01
SS
U
4096
(ground for unipolar mode)
A
DD
= 25 C.
SS
.
(ground for unipolar
–0.5
–1.0
SS
1.0
0.5
0
(ground for
Differential Nonlinearity vs
Output Code
0
(Note 5)
SS
f
SAMPLE
512
(ground
SAMPLE
1024
= 600kHz
1536
OUTPUT CODE
=
2048
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve. The
deviation is measured from the center of the quantization band.
Note 8: Bipolar offset is the offset voltage measured from – 1/2LSB when
the output code flickers between 0000 0000 0000 and 1111 1111 1111.
Note 9: Guaranteed by design, not subject to test.
Note 10: The AC test is for bipolar mode. The signal-to-noise plus
distortion ratio is about 1dB lower for unipolar mode, so the typical
S/(N + D) at 100kHz in unipolar mode is 71dB.
Note 11: Recommended operating conditions.
Note 12: A
specified accuracy. Therefore the minimum supply voltage for the unipolar
mode is 4.95V. The minimum for the bipolar mode is 4.75V, – 2.45V.
Note 13: The falling CONVST edge starts a conversion. If CONVST returns
high at a bit decision point during the conversion it can create small errors.
For best performance ensure that CONVST returns high either within 120ns
after conversion start (i.e., before the first bit decision) or after BUSY rises
(i.e., after the last bit test). See mode 1a and 1b (Figures 12 and 13) timing
diagrams.
2560
3072
IN
3584
must not exceed V
1279 G02
4096
12
11
10
9
8
7
6
5
4
3
2
1
0
10k
ENOBs and S/(N + D) vs
Input Frequency
f
SAMPLE
DD
or fall below V
= 600kHz
FREQUENCY (Hz)
100k
FREQUENCY
NYQUIST
SS
by more than 50mV for
LTC1279
1M
1279 G03
5M
74
68
62
56
50
5